AirHint found the following cheapest return flights from Calgary (YYC) to Lisbon (LIS) in September 2025 (see full year).

Return flights

28 Sep - 10 Oct	WestJet
30 Sep - 25 Oct	WestJet
01 Sep - 27 Sep	WestJet
27 Sep - 11 Oct	Air Transat
13 Sep - 27 Sep	WestJet
11 Sep - 21 Sep	WestJet
06 Sep - 27 Sep	WestJet
08 Sep - 22 Sep	WestJet
29 Sep - 25 Oct	Air Canada
12 Sep - 27 Sep	WestJet
28 Sep - 11 Oct	WestJet
03 Sep - 10 Sep	WestJet
29 Sep - 11 Oct	Air Transat
19 Sep - 11 Oct	WestJet
26 Sep - 11 Oct	WestJet
15 Sep - 13 Oct	WestJet
18 Sep - 30 Sep	WestJet
12 Sep - 14 Sep	WestJet
25 Sep - 11 Oct	WestJet
08 Sep - 19 Sep	Delta

Also check the deals for one-way flights from Calgary to Lisbon in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Calgary to Lisbon in September from 578€

Return flights